Urban Decay Sheer Bittersweet is a cool fuchsia with a luminous finish that is discontinued and retails for $22.00. In comparison, YSL Mauve Nihiliste (58) is a warm purple with a pearl finish that is permanent and retails for $38.00.
YSL Mauve Nihiliste (58) is 90% similar — it is warmer, less glossy.